package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoPoint(){}

    @Before("autoPoint()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行字段自动填充...");

        //获取到当前被拦截的方法上的 数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数--实体对象
        Object[] objects = joinPoint.getArgs();
        if(objects == null || objects.length == 0){
            return;
        }
        Object object = objects[0];
        //准备赋值的属性值
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作的类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(object,now);
                setCreateUser.invoke(object,currentId);
                setUpdateTime.invoke(object,now);
                setUpdateUser.invoke(object,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }else if(operationType == OperationType.UPDATE){
            Method setUpdateTime = null;
            try {
                setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(object,now);
                setUpdateUser.invoke(object,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
